From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC287C433ED for ; Wed, 12 May 2021 11:57:42 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2A28761353 for ; Wed, 12 May 2021 11:57:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2A28761353 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 578716EB7E; Wed, 12 May 2021 11:57:41 +0000 (UTC) Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2B3756EB7C for ; Wed, 12 May 2021 11:57:40 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id DD22967373; Wed, 12 May 2021 13:57:36 +0200 (CEST) Date: Wed, 12 May 2021 13:57:36 +0200 From: Christoph Hellwig To: Peter Zijlstra Message-ID: <20210512115736.GA10444@lst.de> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Subject: Re: [Intel-gfx] 5.13 i915/PAT regression on Brasswell, adding nopat to the kernel commandline worksaround this X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, x86@kernel.org, Linux Kernel Mailing List , hch@lst.de Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Wed, May 12, 2021 at 01:15:03PM +0200, Peter Zijlstra wrote: > IIRC it's because of 74ffa5a3e685 ("mm: add remap_pfn_range_notrack"), > which added a sanity check to make sure expectations were met. It turns > out they were not. > > The bug is not new, the warning is. AFAIK the i915 team is aware, but > other than that I've not followed. The actual culprit is b12d691ea5e0 ("i915: fix remap_io_sg to verify the pgprot"), but otherwise agreed. Someone the i915 maintainers all seem to be on vacation as the previous report did not manage to trigger any kind of reply. _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx